I am very new to this and have only camped a few times at campgrounds that have water. I am camping in about 2 weeks where there is no water available. The owners manual tells me to turn a valve from normal to fill in order to fill up the fresh water tank. It says the valve is in the utility compartment. Sadly, it does not tell a dummy like me where exactly that utility compartment with the valve is. Where to I find this valve to fill the fresh water tank?